From the observation of Fig. REF  a trend across the maximum masses contained in each branch of EoSs, characterized by the speed of sound bound, seems to be inherent. Therefore, we constructed the appropriate diagram of Fig. REF . The cross (star) marks represent the maximum masses of \(n_{\mathrm {tr}}=1.5n_s\)  (\(n_{\mathrm {tr}}=2n_s\) ) case. As the speed of sound bound is getting higher, the marks' color lightens. Similarly to the previous figure, the purple solid horizontal line, with the shaded region, indicates the estimation of the recently observed massive compact object of Ref. [1]}. The red (green) curves represent the following fit formula for the \(n_{\mathrm {tr}}=1.5n_s\)  (\(n_{\mathrm {tr}}=2n_s\) ) case, given below
\(M_{max}=c_1w^{c_2}+c_3w+c_4,\) 
